ชุดท่อขยายระยะ SVBONY Extension Tube Kit, 5mm 10mm 15mm 20mm เกลียว M42 (T2)
Different telescopes can have very different back focus distances. In most telescopes the focal plane is deliberately moved further out, allowing users to attach cameras and other accessories more easily. Refractors always have a rather long back focus since they are usually used with a star diagonal or erecting prism. As a result of this you often cannot directly focus the telescope if you do not use it with the above mentioned accessories. You would have to move the focuser further out, but you reach the end of the focus travel before reaching a focused image. The Solution: This extension tubes bridge the gap between the focuser and the focal plane. They are the ideal solution whenever the focus lies further outside than you can reach with the focuser.
About SvBony Svbony started operation in 2009 as a manufacturer of astronomy and sports optical accessories, based in Shenzhen, China. For astronomy, Svbony offerings include a wide range of telescope parts and adapters for both visual and astrophotography. Svbony emphasize on good product quality at affordable prices, and has a distribution network across the world, with US/AU/UK/ES/DE/IT/FR oversea warehouses. Amateur astronomers world-wide recognize Svbony products to be of excellent value. Svbony also has one of the most varieties of hardware adapters for astrophotography - you will likely find a solution to a hardware connection problem you have. |
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